The third generation of mobile phone technology, offering better coverage for voice calls and text messaging, as well as providing faster access to the internet than our 2G network. We’ll be switching off our 3G services in 2025. Some phones can use wifi to make voice calls. Wifi Calling (also called Voice over Wifi or VoWifi), helps you make and receive calls even if you can't connect to the mobile network, like when you're on the London Underground. When connected to wifi, you can just dial the number you want to call like normal.

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Tesco Mobile is to start charging new and recently joining pay-monthly customers to use their mobiles in Europe from 2024. A micro SIM card is the middle size. These have more plastic around them than a nano SIM, but less than a standard SIM. They also have a slightly larger chip. In terms of smartphones, you might need one of these if your phone is over six years old, but they’re rarely used in recent years. Indeed, they were introduced in 2003, so they’re getting on a bit now.

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If you have the wrong SIM card size for your phone, then wherever possible the best thing to do is simply to request a new one from your network and get your number transferred to that. A SIM card adapter is a piece of plastic that you can place a micro or nano SIM card into to convert it into a larger size. What happens if you take out your SIM card and put it in another phone?

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If you're a regular Superdrug shopper, you can now earn more freebies and discounts under its Health & Beautycard loyalty scheme, as the retailer has launched new 'VIP Rewards' as part of it. No other differences exist between these SIM card types, it’s literally just the size. If there were other differences, then combi SIMs wouldn’t really be possible. An eSIM meanwhile is quite different, as detailed above. 2. Which SIM do I have, and which do I need? While we’re on the subject, it’s worth noting that you’ll still be able to connect to 4G and 3G networks with a 5G SIM card/plan, so you won’t lose access to the older technologies by upgrading to the newer ones. 5. FAQs What are the different SIM card sizes? An eSIM is an embedded SIM card (that’s what the ‘e’ is for) meaning that you can’t remove it from your phone or other device. This is the newest type of SIM and it’s found in quite a lot of modern handsets, such as the iPhone 14 range – along with many other iPhones – and the Samsung Galaxy S22 range. But the main advantages of eSIMs include making it theoretically much easier to change networks and plans – since you can’t change the eSIM in your device, it needs to be possible to change network while keeping the same card, so there’s no need to swap to a new one.All mobile phones use SIM cards but they don’t all use the same size ones, so you’ll need one that’s the right size for your phone. In most cases this will be a nano SIM. Which phones use a nano SIM? The UK’s 3G mobile services, operated by the ‘Big Four’ providers EE, Three, Vodafone and O2, are being phased out over the next few years, starting in early 2023. A mini SIM card is another name for a standard SIM. It was originally called a mini SIM because when it first launched there was a larger full-size SIM card in use too, but these larger ones are no longer used, so mini SIMs have become standard SIMs. What is a SIM card adapter? Three expects the trend of customers using 3G-only handsets to continue to decline, as faster 4G and 5G devices are introduced to the market. As it stands, O2 will be the only provider still offering 3G network services through the whole of 2024.